Firewall stud size?

Does anyone know what the size of these studs are that run along the top of the firewall?

 

Thread size? I am 90% certain that thread will be M6 X 1.00. A hex nut for that thread will be 10mm across flats.

 

Thanks. Yes thread size. I want to run my reverse light harness through loom tubing and nylon clamps to the battery and mount it on the studs.

 

For the nylon clamps, use zinc-plated flat washers (1/4" or 6mm), and nylon insert lock nuts.

 

Not gonna run the idea past all the members to see if approve?

 

I would use something like this....

https://www.ebay.com/itm/264925077105